Drawing implement



May 11 1926.

1,584,507 c. o. T. BOLLING DRAWING IMPLEMENT Filed April 27, 1926 Patented May 11, 1926.

PATENT OFFICE.

CARL O. '1. BOLLING, OF IRWIN, PENNSYLVANIA.

DRAWING IMPLEMENT.

Application filed April 27, 1925. Serial No. 28,120.

My invention relates to a drawing implement and important objects thereof 18 to prpvide a ruling device, adapted to be used in conjunction with a T-square or other straight edge which will facilitate the work of the draftsman and which embodies a plural ty of tri-angles by means of which lines may be ruled in definite like and unlike directions with a minimum of shifting of the implement or without reversing the latter or altering its relation to the straight edge.

lVith the foregoing and other objects in view, which will appear asthe description proceeds, the invention resides in the arrangement and details of construction herein described and claimed, it being understood that changes in the precise embodiment of the invention hereinafter disclosed can-be made within the scope of what is claimed without departing from the spirit of the invention.

The drawing forming a portion of this specification, is a plan View of a drawing implement in accordance with my invention.

Referring in detail to the drawing A denotes a thin, fiat, substantially rectangular body portion, which may be constructed from any suitable material.

The body portion A is provided with a series of tri-angular cut-out portions of substantially equilateral contour indicated at A, C, F and G and each of which is of a different area. The body portion A is furthermore provided with tri-angular cut out portions H and I of substantially right angled contour and each of a different area. Inclined triangular cut-out portions are also provided in the body portion A, as indicated at D and E, and which are of oblique triangular contour and each of a different area. The cut out portions D and E incline from the front to the rear ed e of the body portion A, and the latter is l urthermore formed with a cut out portion B of quadrilateral contour.

The angles 1, 2 and 3, of the triangle A, are respectively thirty, one hundred twenty, and thirty degrees; the angles 4, 5 and 6 of the quadrilateral B, are respectively thirty, thirty, and sixty degrees; the angles 7, 8 and 9, of the triangle C are respectively thirty, one hundred twenty, and thirty degrees;.the angles 10, 11 and 12 of the triangle D, are respectively fifteen, one hundred ten, and fifty-five degrees; the angles 13, 14 and 15, of the triangle E, are respectively, fifteen, one hundred twent and forty-five degrees; the angles 16, 17 and 18, of the triangle F, are respectively, thirty, one hundred five, and forty-five degrees; the angles 19, 20 and 21, of the triangle G, are respectively, forty-ii ve, forty-five and ninety degrees; the angles 22, 23 and 24, of the triangle H, are respectively, thirty, sixty and ninety degrees; and the angles 25, 26and 27, of the triangle I, are respectively forty-five, forty and ninety five degrees.

The side 28, of the triangle A is adjacent to and parallel with the end edge 29, of the body portion A; the side 30 of the triangle A, is adjacent to and parallel with the side 31, of the quadrilateral B, and the side 32 thereof is adjacent to and parallel with the side 33, of the triangle D. The side 34, of the quadrilateral B, is in alignment with the side 32 of the triangle A.

The side 35, of the triangle C, is adjacent to and parallel with the side edge 36, of the body portion A, and the sides 37 and 38 are adjacent to and parallel with the respective angularly disposed side portions 39 and 40 of the uadrilateral The side 41, of the triangle D, is adjacent to the side edge 36, of the bodyportion A, and is disposed at an angle of ten degrees, relatively to the side edge 36. The side 42 is adjacent to and parallel with the side 43, of the triangle E. The side 44 of the triangle E, is adjacent to the side edge 36, of the body ortion A, and is disposed at an angle of fi teen degrees, relatively to the side edge 36.

The side 45, of the triangle F, and the side 46, of the triangle H, extend in alignment and are adjacent to and parallel with the side 47, of the triangle E. The side 48, of the triangle F, is adjacent to and parallel with the side edge 49, of the body portion A, and the side 50 of the triangle F, 1s adjacent to and parallel with the side 51 of the triangle Gr.

The side 52, of the triangle G, is adjacent to and parallel with the side 53, of the triangle H, and the side 54, of the triangle G is adjacent to and parallel with the side 55, of the triangle I. The side 56 of the triangle H, is adjacent to and parallel with the end edge 57, of the body portion A.

The side 58, of the triangle I is ali ned with the side 48 of the triangle F, an the side 59, of the triangle I, is adjacent to the end edge 57 of the body portion A, andvis disposed at an angle of five degrees, relatively to the end edge 57.

It will be obvious that the work of a draftsman will be greatly facilitated by the use of my improved implement, as he 18 enabled to rule a great variety of vertical, horizontal and angularly disposed lines with a minimum of shifting of the device itself against the straight edge, or with the latter. The implement may be positioned against the straight edge in any manner to best meet conditions found in practice.

What I claim is:

A drafting instrument comprising an appropriately thin body portion formed with a pair of oblique triangular cut out portions disposed transversely of and inclining towards the rear edge of and one of greater area than the other, said body portion further formed with a series of said body portion triangular shaped cut out portions arranged between one of said oblique triangular out out portions and one end of said body portion and certain of which being of substantially right angled contour and the other of which being substantially of equilateral contour, each of the cut out portions of said series being of a difl'erent area, said body portion further formed with a pair of triangular cut out portions between the other oblique triangular cut out portion and the other end of said body portion and each of which being of substantially equilateral contour, each of the cut out portions of said pair being of a different area, and said body portion further formed with a cut out portion of quadrilateral contour positioned between said pair of cut out portions.

In testimony whereof I afiix my signature.

CARL O. T. BOLLING. 

